2919
DUAL FULL-BRIDGE
MOTOR DRIVER
2919
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The A2919SB and A2919SLB motor drivers are designed to drive
both windings of a bipolar stepper motor or bidirectionally control two
dc motors. Both bridges are capable of sustaining 45 V and include
internal pulse-width modulation (PWM) control of the output current to
750 mA. The outputs have been optimized for a low output-saturation
voltage drop (less than 1.8 V total source plus sink at 500 mA).
A2919SB
V
BB
LOAD
SUPPLY
1
2
3
24
23
22
21
OUT
OUT
1A
2A
E
1
1
SENSE
E
1
2
2
For PWM current control, the maximum output current is deter-
mined by the user’s selection of a reference voltage and sensing
resistor. Two logic-level inputs select output current limits of 0%, 41%,
67%, or 100% of the maximum level. A PHASE input to each bridge
determines load current direction.
2
SENSE
OUT
4
5
6
OUT
1B
20
I
01
2B
GROUND
GROUND
19
18
GROUND
7
8
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent cross-over currents when switching current direction. Special
power-up sequencing is not required. Thermal protection circuitry
disables the outputs if the chip temperature exceeds safe operating
limits.
GROUND
I
17
16
15
14
13
I
11
02
9
9
θ
PHASE
1
I
1
12
V
10
PHASE
2
θ
2
REF 1
RC
1
11
12
V
REF 2
The A2919SB is supplied in a 24-pin dual in-line plastic batwing
package with a copper lead-frame and heat sinkable tabs for improved
power dissipation capabilities. The A2919SLB is supplied in a 24-lead
surface-mountable SOIC. Their batwing construction provides for
maximum package power dissipation in the smallest possible construc-
tion. The A2919SB/SLB are available for operation from -40°C to
+85°C. To order, change the suffix from 'S–' to 'E–'. These devices
are also available on special order for operation to +125°C. For
applications not requiring quarter-step operation, but desire lower
detent or running current, the similar UDN2916B/EB/LB may be pre-
ferred.
LOGIC
SUPPLY
V
RC
2
CC
Dwg. PP-005
ABSOLUTE MAXIMUM RATINGS
at TJ ≤ 150°C
Motor Supply Voltage, V ................... 45 V
BB
Output Current, I
OUT
(Peak, tw ≤ 20 µs) ........................ ±1.0 A
(Continuous) .......................... ±750 mA
FEATURES
Logic Supply Voltage, V ................... 7.0 V
CC
■ 750 mA Continuous Output Current
■ 45 V Output Sustaining Voltage
■ Internal Clamp Diodes
Logic Input Voltage Range,
V
............................... -0.3 V to +7.0 V
IN
Output Emitter Voltage, V .................. 1.5 V
E
Package Power Dissipation,
■ Internal PWM Current Control
P
....................................... See Graph
D
■ Low Output Saturation Voltage
Operating Temperature Range,
■ Internal Thermal Shutdown Circuitry
■ Half- or Quarter-Step Operation of Bipolar Stepper Motors
T ................................. -20°C to +85°C
Storage Temperature Range,
A
T ............................... -55°C to +150°C
Always order by complete part number:
S
Part Number
A2919SB
Package
RθJA
RθJT
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any
set of conditions, do not exceed the specified peak
current rating or a junction temperature of +150°C.
24-Pin DIP
24-Lead SOIC
40°C/W
55°C/W
6.0°C/W
6.0°C/W
A2919SLB